Is the addition of a trustworthy narrator accepted absolutely?

The questioner : Is the addition of a trustworthy narrator accepted absolutely?

The Shaykh : No, it is accepted only if he is equal in trustworthiness to the other narrator who did not include the addition. If they are equal in trustworthiness, then the addition is accepted. However, if the one who added the text is more trustworthy and has better memory than the one who did not include it, then the addition is not accepted. Likewise, it is not accepted if those who contradict him are more numerous than he is.